Adapter



FIG. 1 is a perspective view of an adapter showing the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a front elevational view thereof; and,

FIG. 7 is a left side view thereof.

The broken lines illustrate portions of the an adapter that form no part of the claimed design. 

CLAIM The ornamental design for an adapter, as shown and described. 